| Swell Space Trading Co., Ltd | Extraterritorial | 2015 |
| Swift Marine Equipment Co., Ltd | Extraterritorial | 2020 |
| Swiftlink Properties Ltd | Real estate | 2019 |
| Switzerland Hebes International Cosmetics Limited | Wholesale & retail | 2023 |
| Switzerland Siac Health Ltd | Manufacturing | 2023 |
| SWS Bearing Ltd | Extraterritorial | 2018 |
| SX Seating International Co., Ltd | Extraterritorial | 2017 |
| SXY Freight Ltd | Transport & logistics | 2019 |
| SY Chemistry Group Co., Limited | Manufacturing | 2024 |
| Syawase Ltd | Extraterritorial | 2023 |
| Sycamore Court Residents Co. Ltd. | Households | 1997 |
| Sygnus Ascent Ltd | Information & communication | 2010 |
| SYN New Materials Limited | Extraterritorial | 2013 |
| Synco Audio Limited | Manufacturing | 2024 |
| Synergy Rail EOT Limited | Administrative & support | 2024 |
| Synergy Rail Limited | Professional & scientific | 2009 |
| Synho Sourcing Co., Ltd | Wholesale & retail | 2024 |
| Syscom Electronics Ltd | Extraterritorial | 2022 |
| SZ Dermatology London Ltd | Health & social care | 2022 |
| T & T Earthmatters Limited | Administrative & support | 2003 |
| T L First Limited | Professional & scientific | 2000 |
| T S Hixson Properties Ltd | Real estate | 2019 |
| T Williams Property Services Ltd | Construction | 2026 |
| T&G Enterprises Limited | Extraterritorial | 2015 |
| T&Sh Properties Limited | Real estate | 2019 |
| T.C.J. Limited | Real estate | 1957 |
| T.J.Morris Home Crafts Ltd | Wholesale & retail | 2021 |
| T.Nano Co., Ltd | Wholesale & retail | 2023 |
| T3 Strategy Limited | Professional & scientific | 2025 |
| T60 Reuse Limited | Real estate | 2023 |
| T60 Reuse Management LLP | | 2023 |
| TA Maintenance Services Ltd | Construction | 2014 |
| TAB Consultants Group Ltd | Construction | 2025 |
| Tacito Limited | Wholesale & retail | 2020 |
| Tadberry Evedale Limited | Manufacturing | 1987 |
| TAG General Builders Limited | Construction | 2019 |
| Taggage Ltd | Professional & scientific | 2019 |
| Tahaney Properties Investment Ltd | Real estate | 2021 |
| Tahirou Services Limited | Construction | 2025 |
| Tahirs Estate Limited | Real estate | 2008 |
| TAI Rong Shipping Limited | Transport & logistics | 2022 |
| Taicang Liyuan Chemical Co., Ltd | Extraterritorial | 2013 |
| Taifa Group Co., Ltd. | Wholesale & retail | 2023 |
| Taihe (Tianjin) Marine Engineering Co., Ltd. | Manufacturing | 2025 |
| Taikoo (UK) Electronic Co., Ltd. | Manufacturing | 2018 |
| Taima Trading Co Ltd | Wholesale & retail | 2020 |
| Taimai Chemical Limited | Extraterritorial | 2008 |
| Taipusen Electrical Limited | Energy | 2025 |
| Taisheng International Trade Co., Ltd. | Professional & scientific | 2024 |
| Taiwan Jida Tyre Co., Ltd. | Manufacturing | 2023 |
| Taiyuan Steel Co., Limited | Wholesale & retail | 2024 |
| Taizhou Guten Machinery Parts Co., Ltd | Extraterritorial | 2017 |
| Taizhou Haifeng Machinery Manufacturing Co., Ltd | Manufacturing | 2020 |
| Taizhou Keencuteer CNC Tools Co., Ltd. | Manufacturing | 2024 |
| Taizhou Lujin Trade Co., Ltd | Extraterritorial | 2019 |
| Taizhou Safehome Manufactory Co., Ltd. | Extraterritorial | 2013 |
| Taizhou Topway Commodity Co., Ltd | Extraterritorial | 2016 |
| Taizhou Twmold Co., Ltd | Extraterritorial | 2014 |
| Taizhou Vipsew Machinery Co., Ltd | Wholesale & retail | 2015 |
| Taizhou Xiongshi Plastic Mould Co., Ltd | Extraterritorial | 2022 |
| Taizhou Yingsheng Goods&Materials Co., Ltd | Wholesale & retail | 2015 |
| Take a Touch Limited | Information & communication | 2026 |
| Talbot Carpentry Limited | Manufacturing | 2025 |
| Talbot Tool Company Limited | Manufacturing | 1940 |
| Talech Consulting Limited | Administrative & support | 2015 |
| Talent Ventures Ltd | Professional & scientific | 2021 |
| Talently Development Ltd | Information & communication | 2021 |
| Talentsphere Technology Ltd | Information & communication | 2024 |
| Tallplus Co., Ltd | Extraterritorial | 2022 |
| Talont Limited | Professional & scientific | 2025 |
| Tamagowave Limited | Information & communication | 2021 |
| Tanabee Global Trade Limited | Extraterritorial | 2007 |
| Tanbre Metals Limited | Professional & scientific | 2006 |
| Tancred & Daley Limited | Real estate | 2022 |
| Tancred Properties Limited | Real estate | 2024 |
| Tandtbars Limited | Hospitality | 2026 |
| Tane Architects Ltd | Professional & scientific | 2018 |
| Tane Limited | Extraterritorial | 2024 |
| Tang Marine Service Co., Limited | Extraterritorial | 2020 |
| Taniwina Petwear Ltd | Wholesale & retail | 2023 |
| TAO Intelligence Limited | Information & communication | 2023 |
| Tappingtoad Ltd | Information & communication | 2016 |
| Tara Court Freeholders Limited | Households | 2001 |
| Tasino Limited | Manufacturing | 2023 |
| Tasker IT Consulting Ltd | Information & communication | 2021 |
| TAT Diesel & Turbocharger Co., Ltd. | Wholesale & retail | 2021 |
| Tateneo Limited | Manufacturing | 2022 |
| Taurus Technology Recruitment Limited | Professional & scientific | 2003 |
| Tautumn Ltd | Health & social care | 2019 |
| Taylah Nails Limited | Other services | 2021 |
| Taylor Blaize Jewellery Consultants Limited | Wholesale & retail | 2018 |
| Taylor Burton International Investment Group Limited | Extraterritorial | 2021 |
| TB Transformation Limited | Professional & scientific | 2024 |
| TBR Floral Design Limited | Other services | 2011 |
| TC Creative Limited | Professional & scientific | 2010 |
| TCA Beckenham Commercial Ltd | Real estate | 2019 |
| TCA Brighton Commercial Ltd | Real estate | 2019 |
| TCA Freeholds Ltd | Real estate | 2019 |
| TCA Holdings (UK) Limited | Real estate | 2012 |
| TCA Investments Limited | Real estate | 2011 |